[calls/wip/compiler-warnings: 11/12] main-window: Add default case to switch statement

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 3c219495384e77c996154945164e867bc043fcb1
Author: Evangelos Ribeiro Tzaras <evangelos tzaras puri sm>
Date:   Wed Jun 2 20:42:50 2021 +0200

    main-window: Add default case to switch statement
    
    As caught by compiling with `-Wswitch-default`

 src/calls-main-window.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/calls-main-window.c b/src/calls-main-window.c
index 03590fba..fb2da480 100644
--- a/src/calls-main-window.c
+++ b/src/calls-main-window.c
@@ -331,6 +331,9 @@ state_changed_cb (CallsMainWindow *self,
     case CALLS_MANAGER_STATE_NO_PLUGIN:
       error = _("Can't place calls: No plugin");
       break;
+
+    default:
+      g_assert_not_reached ();
     }
 
   gtk_label_set_text (self->permanent_error_label, error);